High-pressure single-crystal neutron diffraction (to 20 kbar) using a pulsed source: preliminary investigation of Tl3PSe4
High-pressure single-crystal neutron diffraction (to 20 kbar) using a pulsed source: preliminary investigation of Tl3PSe4
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使用脉冲源的高压单晶中子衍射（至 20 kbar）：Tl3PSe4 的初步研究
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
B. Morosin
中科院分区：
文献类型：
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作者：
R. Alkire;A. Larson;P. Vergamini;J. Schirber;B. Morosin
本文介绍了一种新的高压单晶中子衍射技术[室温下可达20千巴（2 GPa）]，它采用铍铜压力室、面探测器和洛斯阿拉莫斯国家实验室脉冲中子源。 这种方法的成功取决于多波长脉冲中子源提供的信息的增加，一个新的取向的圆柱对称的压力单元与其轴重合的中子束和特定的晶体取向内的压力单元。避免了来自压力池的布拉格散射，并且对于给定的2θ，背景是恒定的。对于斜方晶系或更高对称性的晶体，当入射光束通过主要晶格矢量之间的中间时，可以仅用一次压力加载收集的数据来细化完整的三维结构。在15（1）kbar下对Tl3PSe4晶格参数（空间群Pcmn）的初步研究得到线性压缩系数（× 1000 kbar−1）为Ka = 1.05（8），Kb = 1.50（10），Kc = 1.20（8）。各向异性的压缩性解释了检查的环境压力的室温结构。
A new technique is described for performing high-pressure single-crystal neutron diffraction [up to 20 kbar (2 GPa) at room temperature], using a BeCu pressure cell, an area detector and the Los Alamos National Laboratory pulsed neutron source. Success of this method depends on the increase in information available with a multi-wavelength pulse neutron source, a novel orientation of a cylindrically symmetric pressure cell with its axis coincident with the neutron beam and a specific crystal orientation within the pressure cell. Bragg scattering from the pressure cell is avoided and background for a given 2θ is constant. For a crystal of orthorhombic or higher symmetry oriented with the incident beam passing midway between the major lattice vectors, it will be possible to refine a complete three-dimensional structure with data collected from only one pressure loading. Preliminary investigations of Tl3PSe4 lattice parameters (space group Pcmn) at 15(1)kbar yielded linear compressibilities (× 1000 in kbar−1) of Ka = 1.05(8), Kb = 1.50(10), Kc = 1.20(8). The anisotropic compressibility is explained by examination of the ambient-pressure room-temperature structure.